Bobbin for weft-replenishing looms



Patented Dec. 10, 1929 UNITED STATES f PATENT OFFIcr.A

RICHARD G. TURNER, loF WORCESTER, MASSACHUSETTS, AssIGNoR To CROMPTON atK-NowLEs LOOM WOR-xs, or' WORCESTER,MASSACHUSETTS, A CORPORATION orMASSACHUSETTS BOBRIN FOR WEFT-REPLENISHI'NG LooMs Application ledDecember 6, 1928.,.Sera1 No. 324,133.

ly employs a feeler or weft detector which is brought in contact withthe yarn of the active shuttle at regularly recurring intervals dur--ing the operation of the loom. In the case of silk and similar fineyarns the tendency is to wind as much yarn on the bobbin as possible andthis is accomplished by employing a relatively high tension during thewinding operation. The result is the formation of a bobbin the weftdetector engaging surface of which is very hard, so hard in fact thatcertain types of detectors coact with the detector the same way that thebare barrel of the bobbin does, that is, to give indication of weft eX-haustion. Under these conditions the indications are always prematureand the weft replenishing mechanism is depleted of its re-V Y servebobbins to no useful purpose.

In side slipping weft detectors for instance there is an element whichtends to move to theside along the bobbin while in Contact with thelatter, being urged to undergo this mOvement either by a force derivedfrom the bob-l bin itself or from some yielding force which is appliedonly after the detector engages the bobbin. The teeth on such a detectormust be able to embed themselves' an appreciable amount in the yarn onthe bobbin in order to prevent premature indication and it is an iin-`portant object of my present invention to. wind the bobbin so that thosecoils or con volutions of yarn which are to be engaged by the detectorwill be Wound under less tension and will therefore be more readilypenetratedY In the case of one form of Winder which has' gone into verycommon use a pairl of yieldable' disks are provided between which theyarn runs,v said disks being held together by means of an adjustableweight which may gcause a variation in the pressure existing between thetwo disks. y My invention is not con ceined with the particularmechanismfor varying the pressure on the disks or the tension to whichYthe yarn is subjected but is directed more particularly to the woundbobbin.

'A lith these and other objects view which will appear as kthedescription .proceeds my invention resides the combination andarrangement of parts hereinafter ldescribed and set forth in theclaims.'

-In the accompanying drawings wherein a convenient Yembodiment ofmyinvention is Vset forth, l

Fig. l is a top plan view of a bobbin made accordinggto my presentinvention and showing thev same in contact with the'rear end of aweftdetector, Y

Fig. 2 isv a'verticalsection on line'Q-Q of Fig. l on an enlarged scaleshowing the difference in the character'of coils of yarn.

Referring to Fig. l I have shown abobbin having a butt 10 and a smallerVbarrel portion 11. The .butt may be provided with the usual rings 1'2tohold the same in the springs of the shuttle not shown. A weft detector13 is representative of any one of a number of mechanismsof this ty e,there being shown herewith the rear portion of a detectorl arm of a sideslip type, said'arm having teeth 14 which are adapted'to be embeddedinthe yarn of the bobbin. The unwound bobbin together with the detectorof themselves form yarn thereon wound tightly and the other wound underless tension. As shown' inthe drawings I provide a Zone near the butt ofthe bobbin and of sufficient length sothat f anyof the-.usual types ofweft detectors will be llikely to engage yarn-lying in this zone. Thecoils o f this Zone are'wound loosely and under a comparatively lowtension so that-the particularly to i may 'be `Wound 'under -as .tight atension'as desired.

The bobbin Will be :transferred Pas :is usual by Well-known mechanisminto any of the shuttles in common-use and when so placed will havethezone 20 presented to the detector 13. Because of the 4fact that `thisportion of the bobbin is soft 'it Will coact properly with the'detecto'rto preventjprematnfre indication,

AFrom-the foregoing itwill be seen that I 'have provided a verysimplemeans for r'e-'ndering a "bobbin particularly yusable with "weftdetectors, a portion of thebobbin being aighfiy.

Wound suiciently soft to cooperate properly With the detector and theremainder of the bobbin being vWound'u'nder increased tension so as toincrease thecarrying capacity of the bobbin.y A lsingle continuousstrand of yarn is Wound under varying conditions of'tension and `therebyvproduces va bobbin especially adaptable for-weft replenishing looms.

Y Having thus described my invention it will 4be :apparent that changesand lmodiica'tions 'may be 'made therein by those skilled in the artWithout ldeparting from the spirit and scope of the invention and 'I fdo'not wishfto fbelimite'd' to the details hereindisclosed, but

A bobbin for `weft replenishingvlooms having zyarn Wound thereon a:portion of lWhich vis tightly Wound .and another pon `tion of Whichiislooselyiwound,

12. .A :bobbin :to cooperate Wfithja fWet dethe detector being vlooselyxvound and .the

yarn in the other zone :being tightly `-Wou-nd.

A 'bobbin to be used with a vveftdeteetor dependent :upon its ability to:penetrate the yarn to prevent indication .of weftexhausvtion;said:bobbin having a mass of 'loosely .Wound yarn:positioned-to cooperate"-Wit'hzthe detector and having anotherportionofrtigh't- Vly.vvo'ur'rd'ya-ir routfof operative position withrespecttozthefdetecton y Y f'loo'selfy: andthe remainder Aof Which`isvwound 5. -A "htbifn fior @operai-,ion with a weft etrhavifng arelatifviyfsofbmasseff-yarn vpesieieneaftaeeeperate with fehefdetecorand @giving the ammi-nder ef `the mass far yarn senavayfaae. i

6. A bobbin t0 be used with a weft detector having yarn Wound thereon aportion of Which is under relatively low tension to cooperate With thedetector and the remainder of Which is under relatively high tension to"increase .the carrying capacity of the bobbin.

Intestimony whereof I have hereunto affixed lmy .signatures RICHARD fe.

